Abstract
Single crystals of sodium potassium sulphate doped with Co 2+ ions were grown from an aqueous solution. Their optical absorption spectra have been recorded at room and liquid-nitrogen temperature. The observed bands have been explained as being due to Co 2+ ions in octahedral symmetry. All the transitions are from the ground 4T 1g(F) state to various quartet and doublet states. The splittings observed at liquid-nitrogen temperature are explained as being due to the spin-orbit interaction. The experimental and calculated energies are in good agreement. The crystal field parameters are derived.
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